Search Results 1-20 of 1046

  • Triple-Wavelength Photoacoustic gas detection for a smart endoscopy  [in Japanese]

    Wadamori Naoki

    … <p>Endogenous gas analysis such as gastric and intestinal gas potentially offers a fast and convenient noninvasive diagnostic method for a variety of diseases. … An array of modulated laser diodes and its controller were developed and coupled via an optical fiber bundle a photoacoustic sensor head, because interferences of other compounds can be reduced by using several laser wavelengths.A mixture of CO2 and N2 gases was measured using a triple-wavelength optical source (450, 1420, 1540 nm) to detect the various compounds. …

    Transactions of Japanese Society for Medical and Biological Engineering Annual58(Abstract), 435-435, 2020

    J-STAGE 

  • Improvement of Two-Fluid Model Based 1D Code with the State-of-the-Art Constitutive Equations for Two-Phase Flow in Rod Bundle  [in Japanese]

    OZAKI Tetsuhiro , HIBIKI Takashi , MIWA Shuichiro , MORI Michitsugu

    … <p>In view of the importance of one-dimensional thermal-hydraulic analysis for rod bundle geometry, extensive efforts to improve constitutive equations have been made in recent years. … In the present review article, state-of-the-art of the rod-bundle constitutive equations for flow regime map, void fraction, covariance, and interfacial area concentration models is reviewed. …

    JAPANESE JOURNAL OF MULTIPHASE FLOW 34(2), 342-351, 2020

    J-STAGE 

  • Performance Evaluation of Particleboard Using Vascular Bundles Separated from Oil Palm Trunk  [in Japanese]

    HORIYAMA Hiroaki , KOJIRO Keisuke , MIYOSHI Yuka , TANAKA Ryohei , ITOH Takafumi , KAJITA Hiromu , FURUTA Yuzo

    … <p>As an effective utilization method of the oil palm trunks, particleboards were prepared using vascular bundles of the trunks. … Some particles contained parenchyma, attached to the surface of a vascular bundle, but most of particles were vascular bundles only. …

    Journal of the Society of Materials Science, Japan 69(6), 434-439, 2020

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  • Effect of new drywell cooler application for venting start time during severe accidents

    ISHIDA Naoyuki , NAGATA Yasunori , KIMURA Ryusuke , ANDO Koji

    … We have been developing a new drywell cooler specialized for severe accidents (DWC_SA) as one additional PCV cooling method. … We have already conducted element tests using a small tube bundle to confirm the occurrence of continuous downward flow with the DWC_SA configuration and to measure heat transfer rate of condensation with non-condensable gas (NCG). …

    Mechanical Engineering Journal 7(3), 19-00550-19-00550, 2020

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  • Numerical simulation of two-phase flow in 4x4 simulated bundle

    ONO Ayako , YAMASHITA Susumu , SUZUKI Takayuki , YOSHIDA Hiroyuki

    … Hence, the 3D detailed numerical simulation by the mechanistically based method is expected to be applied for the preliminary analysis to improve the design of fuel assemblies and evaluate the safety. … The detailed numerical simulation method can provide much information relating to the two-phase flow such as the bubble size, its velocity, and detailed void distribution which, for example, are needed to predict the critical heat flux based on the mechanism. …

    Mechanical Engineering Journal 7(3), 19-00583-19-00583, 2020

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  • On the degradation progression of a BWR control blade under high-temperature steam-starved conditions

    PSHENICHNIKOV Anton , NAGAE Yuji , KURATA Masaki

    … In the latest test, a mock-up of BWR bundle material has been investigated under postulated Fukushima Dai-Ichi (1F) unit 2 accident conditions in a complex heating transient scenario including a phase of lack of available steam. … The progress in control blade degradation was monitored with help of an in situ video and the detailed analysis of the solidified metallic melt, so-called "metallic debris", was carried out by conventional SEM EDS method. …

    Mechanical Engineering Journal 7(3), 19-00503-19-00503, 2020

    J-STAGE 

  • Effect of Amorphous Carbon Coating of Carbon Fiber on Mechanical Properties of Carbon Fiber Reinforced PA6  [in Japanese]

    TANAKA Kazuto , HABE Ririko , KATAYAMA Tsutao , NAKATSUKA Kazuki

    … Generally, thermoplastic resins have a higher viscosity at the time of molding than thermosetting resins, and it is difficult to impregnate matrix resin into a reinforcing fiber bundle. … Therefore, in order to improve the mechanical properties of CFRTP, it is important to develop a new method for improving the impregnation property and the fiber and matrix interfacial adhesion. … In recent years, a method for coating the surface of carbon fiber with amorphous carbon has been developed. …

    Journal of the Society of Materials Science, Japan 69(5), 365-372, 2020

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  • Animal models in addiction research  [in Japanese]

    Ide Soichiro , Ikeda Kazutaka

    … </p><p>In recent years, although self-administration tests and conditioned place preference tests have been widely used as drug-dependence evaluation methods, intracranial self-stimulation (ICSS) method that electrically stimulate the medial forebrain bundle (lateral hypothalamic region) of the mesolimbic dopamine system could be also useful tools that can provide different insights in drug dependency assessment. …

    Proceedings for Annual Meeting of The Japanese Pharmacological Society 93(0), 1-S04-2, 2020

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  • 3. Reactor Physics and Reactor Engineering

    CO3-10 Measurement of ²³⁸U(n, γ) γ Ray from Subcritical System (2) /Y. Nauchi et al.(CA3008) [146]

    KURNS Progress Report (2018), 137-153, 2019-08

    IR 

  • Construction of a Quadrangular Tetramer and a Cage-Like Hexamer from Three-Helix Bundle-Linked Fusion Proteins

    Miyamoto Takaaki , Hayashi Yugo , Yoshida Keito , Watanabe Hiroki , Uchihashi Takayuki , Yonezawa Kento , Shimizu Nobutaka , Kamikubo Hironari , Hirota Shun

    … Herein, we constructed fusion protein 1 by linking the C-terminus of a dimerization domain and the N-terminus of another dimerization domain with a three-helix bundle protein, where it self-assembled mainly into tetramers. … These results show that the present method utilizing three-helix bundle-linked fusion proteins is useful in the construction of protein nanostructures. …

    2019-05-17

    IR 

  • Remarkable complexity and variability of corticospinal tract defects in adult Semaphorin 6A knockout mice

    桝 正幸 , 岡田 拓也 , 桝 和子 , Takuya OKADA , Kazuko KEINO-MASU , Fumikazu Suto , Kevin J. Mitchell , Masayuki MASU

    … First, a subset of fibers that separated from and descended in parallel to the main bundle projected laterally at the caudal pons, subsequently changed direction by turning caudally, and extended to the medulla. … Section immunostaining combined with 3D reconstruction is a powerful method to track long projection fibers and to examine the entire nerve tracts of both normal and abnormal animals. …

    Brain Research (1710), 209-219, 2019-05

    IR 

  • Mechanism of Twisting of Fiber Bundle in a Curved Section of 3D Printed Carbon Fiber Reinforced Plastics  [in Japanese]

    SHIRATORI Hirohide , TODOROKI Akira , UEDA Masahito , MATSUZAKI Ryosuke , HIRANO Yoshiyasu

    … Injection molding is a typical method for fabricating CFRTP, however, this method requires a mold, and hence it is difficult to use this method to fabricate complex geometries. … Previous studies have revealed that a fiber bundle becomes twisted in a curved section, and this might affect the mechanical properties of 3D printed CFRTP. … In the present study, the mechanism of twisting a fiber bundle in a 3D printed CFRTP is investigated. …

    Journal of the Japan Society for Composite Materials 45(4), 149-154, 2019

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  • Development of the hydrogen pressure vessel strength model considering fiber bundle cross-overs  [in Japanese]

    KANEKO Tomonori , NISHIHARA Tsuyoshi , YAMAMOTO Takuya , YOSHIKAWA Nobuhiro , AONO Masahiro

    … The most effective method for the reduction is concerned with strength evaluation of Carbo Fiber Reinforce Plastic (CFRP). … The tank is manufactured by filament winding method. … Carbon fiber bundle cross-overs caused by helical filament winding easily raise stress concentration, which cannot be evaluated by conventional model based on continuum anisotropic body formulated by rule of mixture. …

    The Proceedings of the Materials and Mechanics Conference 2019(0), OS2106, 2019

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  • Effects of grid spacer with vanes on liquid film for gas-liquid two-phase annular flow in 3×3 rod bundle channel  [in Japanese]

    KAWAHARA Akimaro , YONEMOTO Yukihiro , TAZOE Hiroto , MUTA Koshi , HISATSUGU Yudai

    … <p>This paper reports the effects of the grid spacer with mixing vane (MV) on gas velocity for air single-phase flow and liquid film thickness for air-water two-phase annular flow in a 3×3 rod bundle channel. … Gas velocity was measured with hot-wire anemometer and liquid film thickness was measured with constant electric current method. …

    The Proceedings of Mechanical Engineering Congress, Japan 2019(0), S08117, 2019

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  • Effect of spacer with mixing vane on liquid film for two-phase annular flow in a simulated BWR reactor fuel rod bundle channel  [in Japanese]

    MUTA Kohshi , TAZOE Hiroto , HISATUGU Yudai , YONEMOTO Yukihiro , Kawarhara Akimaro

    … <p>This study concerns with air-water annular flow across a grid spacer with mixing-vanes in a vertical 3×3 rod bundle channel. … The film thickness distribution was measured with constant electric current method. …

    The Proceedings of Conference of Kyushu Branch 2019.72(0), D32, 2019

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  • SIMULATION AND VALIDATION OF TURBULENT MIXING IN CHANNEL WITH NEK5000

    Ju Haoran , Wang Mingjun , Tian Wenxi , Su G.H. , Qiu Suizheng

    … Turbulent mixing through gaps is an important intersubchannel phenomena in fuel rod bundle in reactor core, which leads to momentum and energy transfer with no net mass transfer between adjacent subchannels in the fuel assembly. … In this paper, a high-scalable high-performance spectral element method CFD code NEK5000 combining high passed filtered LES model has been employed to simulate turbulent flow through parallel wall channel and square channel with a cylindrical rod for single-phase flow. …

    The Proceedings of the International Conference on Nuclear Engineering (ICONE) 2019.27(0), 2305, 2019

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  • THREE DIMENSIONAL THERMAL HYDRAULIC COUPLING METHOD ON PWR STEAM GENERATOR USING CFD METHOD

    Zhao Xiaohan , Wang Mingjun , Tian Wenxi , Su G.H. , QIU Suizheng

    … To deeply reveal the three-dimensional heat transfer characteristics of the whole SG, a three dimensional thermal hydraulic coupling method is established based on the porous media method and CFD software in this research. … The geometry of the SG is simplified to some extent at the first step in this research which both sides of the tube bundle zone are considered as a unified volume based on the porous media method. …

    The Proceedings of the International Conference on Nuclear Engineering (ICONE) 2019.27(0), 2322, 2019

    J-STAGE 

  • RESEARCH ON THE CHARACTERISTIC OF HEAT EXCHANGER WITH TREFOIL-HOLE BAFFLE BASED ON FIELD SYNERGY PRINCIPLE

    Wei Zhiguo , Wang Wei , Ke Hanbing , Yang Linping , Huang Chonghai , Xiao Qi

    … However, this also brings about problems such as increased resistance of the heat exchanger and induced vibration of the tube bundle, which has a negative impact on the overall efficiency and reliability. … This type of support plate structure was mainly applied to the steam generator tube bundle support in the early stage. …

    The Proceedings of the International Conference on Nuclear Engineering (ICONE) 2019.27(0), 1386, 2019

    J-STAGE 

  • INVERSE UNCERTAINTY QUANTIFICATION OF CTF PHYSICAL MODEL PARAMETERS USING BAYESIAN INFERENCE

    Liu Junhong , Huang Shanfang , Guo Xiaoyu , Wang Jiageng , Wang Kan

    … In this study, the OECD/NRC BWR Full-size Fine-Mesh Bundle Tests (BFBT) benchmark steady-state void fraction data is used as the prior knowledge and Bayesian inference is implemented to formulate the IUQ problem. … The results also show that two MCMC algorithms take the advantages of self-adaptive method, capable of inferring the posterior distribution of model parameters with arbitrary form of prior information. …

    The Proceedings of the International Conference on Nuclear Engineering (ICONE) 2019.27(0), 1435, 2019

    J-STAGE 

  • CFD STUDY ON FLOW CHARACTERISTICS OF FUEL ROD BUNDLE WITH SPACER GRID

    Yimeng Liu , Shaodan Li , Gang Chen , Xiaohui Zhang , Jiange Liu

    … In order to study the flow characteristics among the rod bundles, computational fluid dynamics (CFD) method has been used to simulate the flow state in fuel rod bundles under different flow state. …

    The Proceedings of the International Conference on Nuclear Engineering (ICONE) 2019.27(0), 1247, 2019

    J-STAGE 

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